Rolls

imo you don't need big duration on a turbo motor, just means more boost ends up out the exhaust.

what did you expect going there with coilovers? 0% chance of them passing adjustable coilovers.

Both ECUs are perfectly capable for your goals, no reason to change.

That's what I thought, was just checking.

If you can fit it into the stock housing then thats a good option! Looking stock was the point I was trying to make.

stock bov, aftermarket bov, no bov are all safe however venting to atmosphere or running no bov will cause it to run rich on changes and may cause stalling issues. Personally I would run stock recirc, doesn't sound gay, makes tuning easier, no stalling or running rich on gear change issues due to not messing with the MAF, it also leaks on idle and vac which can help turbo spool.

nistune will pass an inspection, power FC wont. I'd be choosing it purely on that basis.

dead motor due to the turbos grenading? or dead motor from that much torque?

Yeah I've tried telling that to people a lot of times, same with the softer suspension = more traction.

They are fine for what they built them for, stock power levels.

How can you lose your license for 4 years for a single traffic offense? You must have stacked them up prior to that to get done for 4 years. My house mate lose license for drinking driving, then got caught again unlicensed AND drunk and only lost it for 3 years with no lawyer or anything, just pleaded guilty.

From what I read the tyres ability to deform was just if not more important than the suspension. As how much time the tyre has to deform influences its coefficient of friction, for the same reasons as you explained with the suspension. So in a perfectly simplistic model rate of torque wouldn't be an issue and instantaneous torque would be all that mattered (where I was going wrong in my first post), but when you include dynamic things like suspension and tyres it becomes extremely important (eg the real world). Good post.

Totally agree, he should have it rebuilt with bigger spec steel wheels imo. 15psi is really pushing the efficiency of the turbo, in the midrange it'll make more power, top end I doubt it.

Yeah you can run more like 14psi on an rb20 fairly safely, much over 12 on 25s and they seem to destroy themselves, haven't ever heard of it happening on a 20 though, stock 20 turbo yes, but not 25 one.

You lost your license for 10 years??? wtf did you do, repeat drink driving without a license?

Make a new thread, I'm curious what other people have to say that haven't seen this thread.

If the head is the right size, then what would cause massive pinging like this?

More flow = less velocity which means up high it will be better but down low it will suck as down low it can already flow enough.

no just remove the boost solenoid

Your example is wrong. anyway, enough off topic

neo rb25 heads are meant to be smaller than r33 rb25 ones, perhaps that is where he is getting that figure from.

Ok after some reading and thinking I agree, but not from the examples given haha. The stuff I read about was tyre deformation, eg if you spend 10 seconds applying a torque figure x that doesn't cause wheel spin, if you decrease the time from 10 and tend towards 0, there will always be a time factor that causes wheel spin, due to the tyre not having enough time to deform. The clutch example is bad harey, a better one would be stabbing the throttle as theres no stored up energy and torque multiplcation from a slipping clutch.

Traction, torque, force are all instaneous things, a sharp rate of torque increasing is something that happens over time. A sharp increase in torque is more likely to sustain wheel spin, but if the torque figure during that sharp rise never exceeds what your wheels can put to the ground, it won't cause any spin.

I did and it isn't correct, it is the actual torque value that causes wheel spin, not whether it is increasing or not. If it increases steeply it is more likely to maintain wheel spin and not a single chirp though which is what I think you are getting at. read my edited post.

Can someone give a scientific reason why this is so? I'm not convinced. There is a limit of grip the tyre can provide, the only force acting on the tyre is the torque turning it, I don't see why a fast increase in torque would cause this? I can see why fastly increasing torque might be conducive to wheel spin, but it in itself won't cause it. Eg you break traction with x torque, the wheel spins increasing rpm which also increases torque hence it spins faster. If you have flat torque it will not continue to spin like this, however if the torque value is enough to cause the wheel spin in the first place it will still cotinue to spin, it just won't smash the limiter like a steep torque curve would.. If the torque curve is dropping off and x torque causes it to spin, the increase in rpm would cause the torque to drop and hence stop the tyre spinning, but if it doesn't drop below the value required to spin it in the first place, it will continue to spin. edit: That was confusing to write lol.